package eu.siacs.conversations.crypto;

import androidx.annotation.Nullable;

import com.google.common.collect.Iterables;

import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

public final class TrustManagers {

    private TrustManagers() {
        throw new IllegalStateException("Do not instantiate me");
    }

    public static X509TrustManager createTrustManager(@Nullable final KeyStore keyStore)
            throws NoSuchAlgorithmException, KeyStoreException {
        final TrustManagerFactory trustManagerFactory =
                TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        trustManagerFactory.init(keyStore);
        return Iterables.getOnlyElement(
                Iterables.filter(
                        Arrays.asList(trustManagerFactory.getTrustManagers()),
                        X509TrustManager.class));
    }

    public static X509TrustManager createDefaultTrustManager()
            throws NoSuchAlgorithmException, KeyStoreException {
        return createTrustManager(null);
    }


}